OpusCalc Pro: Contractor Calc

OpusCalc Pro is a professional construction calculator for contractors, framers, and tradespeople who need accurate math on the job site — in feet, inches, and fractions.

Try all 11 calculators free. Get IRC-compliant stair layouts, concrete yardage, stud counts, rafter lengths, and material estimates with a custom imperial keyboard built for field use.

11 PROFESSIONAL CALCULATORS

Stair Stringer — IRC 2021-compliant layouts with exact riser heights, tread counts, and total run.

Roof Rafter — Common, hip, and valley rafters with precise fractional outputs for any pitch.

Stud Count — Field studs, corners, T-wall intersections, openings, and plate material with 5%, 10%, or 15% waste margins. 16" and 24" O.C.

Drywall — Sheet counts from gross area minus doors and windows, with adjustable waste.

Paint — Gallons by coat count, adjusted for doors and windows.

Flooring & Tile — Tile or box counts with adjustable waste so you don’t under-order.

Concrete Volume — Cubic yardage for slabs, columns, and footings, plus pre-mix bag counts.

Block & Brick — CMU and brick estimates with mortar bag counts and waste margins.

Right Angle — Square up layouts with 3-4-5 triangle math.

Area & Volume — General area and cubic yard calculator with waste margin.

Fractions — Convert between fractions and decimals instantly.

PROJECT MANAGEMENT (OPUSCALC PRO)

With an OpusCalc Pro subscription, save calculations to named projects, sync in the cloud, and export branded PDFs to share with clients or your crew via email or your device’s share menu. Search, rename, and manage projects from one screen.

BUILT FOR THE FIELD

High-contrast dark mode for outdoor readability. Custom dimensional keyboard for fast fractional input — no fumbling with decimals on the job site.

SUBSCRIPTION

Try all 11 calculators free before subscribing. OpusCalc Pro unlocks unlimited calculations and project save/sync. Monthly and yearly plans available. Payment charged to your Google Play account. Cancel anytime in Play Store subscriptions.

Support: support@opuscalc.com

Built by RM Digital Enterprise LLC

Recent changes:
• Improved readability for field use — clearer labels, results, and category colors
• Key order quantities (yards, sheets, studs, and more) highlighted in gold
• Fixed paywall close button placement
• Smoother navigation and stability improvements